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參數資料
| 型號： | WM2638ID |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | TVS UNI 225W 6V PWRDI 123 SMD |
| 中文描述： | 雙路12位串行輸入電壓輸出DAC，帶有內部參考 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 360K |
| 代理商： | WM2638ID |
WM2638
Dual 12-Bit Serial Input Voltage Output DAC
with Internal reference
Production Data, Rev 1.0, July 1999
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
http://www.wolfson.co.uk
Production Data
contains final specifications
current on publication date. Supply of products
conforms to Wolfson Microelectronics' Terms
and Conditions.
Last printed 15/07/99 15:58
1999 Wolfson Microelectronics Ltd
.
FEATURES
Two 12-bit voltage output DACs
Single 2.7V to 5.5V supply operation
DNL
±
0.4 LSBs, INL
±
2 LSBs
Low power consumption
12mW typical in fast mode
6mW typical in slow mode
TMS320, (Q)SPI
, and Microwire
compatible
serial interface
Programmable settling time 1
μ
s or 3.5
μ
s typical
Power down mode 10nA
APPLICATIONS
Arbitrary waveform generation
ORDERING INFORMATION
Battery powered test instruments
Digital offset and gain adjustment
Battery operated/remote industrial controls
Machine and motion control devices
Cellular telephones
Wireless telephones and communication systems
Speech synthesis
DEVICE
TEMP. RANGE
PACKAGE
WM2638CD
0° to 70°C
8-pin SOIC
WM2638ID
-40° to 85°C
8-pin SOIC
DESCRIPTION
The WM2638 is a dual 12-bit voltage output, resistor string, digital-
to-analogue converter. A software controlled power down mode is
provided that reduces current consumption to 10nA.
The WM2638 features an internal programmable voltage reference
simplifying overall system design. A reference voltage may also be
supplied externally.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2638 is programmed with a 16-bit serial word
comprising of a latch address, mode control bits and DAC or
control data.
Excellent performance is delivered with a typical DNL of 0.4LSBs.
The programmable settling time allows the designer to optimise
speed versus power consumption. The output stage is buffered by
a x2 gain near rail-to-rail amplifier.
The device is available in an 8-pin SOIC package ideal for space-
critical applications. Commercial temperature (0° to 70°C) and
Industrial temperature (-40° to 85°C) variants are supported.
BLOCK DIAGRAM
TYPICAL PERFORMANCE
(7) OUTB
(4) OUTA
12-BIT
DAC B
HOLDING
LATCH
12-BIT
DAC A
LATCH
REF(6)
POWER-ON
RESET
DIN (1)
SCLK (2)
NCS (3)
(5)
AGND
POWERDOWN/
SPEED
CONTROL
12-BIT
DAC B
LATCH
DAC
OUTPUT
BUFFER
2-BIT
CONTROL
LATCH
X1
X2
X2
DAC
OUTPUT
BUFFER
REFERENCE
INPUT
BUFFER
X1
REFERENCE
INPUT BUFFER
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
2-BIT
REFERENCE
SELECT
LATCH
1.024V/2.048V
SELECTABLE
REFERENCE
X1
VDD
(8)
c
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
WM2638
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
512
1024
1536
2048
2559
3071
3583
4095
DIGITAL CODE
D
5V = VDD, V
REF
= External, Speed = Fast mode, Load = 10k/100pF
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